JPH054474B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) This invention relates to a method for dyeing recycled cellulose fibers or fiber structures. (Prior Art) Viscose fibers generally show good dyeability with direct dyes and reactive dyes, but are hardly dyed with cationic dyes. An attempt to improve the dyeability of cationic dyes and to uniformly dye cationic dyes at the same time without impairing the texture of cellulose in blended, knitted and woven textile products of viscose fibers and acrylic fibers or cationically dyeable polyester fibers. is being done. For example, a method in which cellulose fibers are pretreated with tannic acid at the cotton or yarn stage to make them cationically dyeable is dyeable with cationic dyes in light colors, but poor color fastness in dark colors, making it impractical. Furthermore, the method of carboxymethylating cellulose fibers to make them cationically dyeable impairs the texture and hygroscopicity of the cellulose fibers, which is also not practical. Furthermore, Japanese Patent Publication No. 57-19207 discloses that aromatic acyl groups or aromatic sulfonic groups are introduced into cellulose fibers only on the surface portion thereof using aromatic carboxylic acid or aromatic sulfonic acid, and then sulfuric ester groups or sulfonic acid groups are introduced into the cellulose fibers. A method of cationic dyeability in the presence of an anionic surfactant containing a group of surfactants is disclosed.
This method also deteriorates the texture of cellulose, and when dyed in a deep color, there are still problems in terms of fastness. As mentioned above, when cellulose fibers are made cationically dyeable, there is a drawback that the texture of cellulose is impaired to some extent, and neither of these methods is useful. (Problems to be Solved by the Invention) The object of the present invention is to achieve dyeability with direct dyes and reactive dyes that is almost the same as that of ordinary recycled cellulose fibers, and to combine regenerated cellulose fibers dyeable with cationic dyes with acrylic. An object of the present invention is to provide a dyeing method with excellent fastness that allows simultaneous dyeing of blended yarns, blended woven and knitted fabrics, and mixed woven and knitted fabrics with cationic dyes. (Means for Solving the Problems) The method of the present invention involves treating regenerated cellulose fibers or fiber structures containing polystyrene sulfonate with an aqueous solution of tannic acid before or after dyeing when dyeing them with a cationic dye. It is characterized by The polystyrene sulfonate referred to in the present invention has a molecular weight of usually 1,000 to 2,000,000, preferably 5,000.
~500,000. The content is usually 0.1 to 20% by weight, preferably 0.3 to 20% by weight based on cellulose.
It is 10% by weight. The recycled cellulose fiber may be either viscose process rayon or copper ammonia process rayon. Fiber structures include not only recycled cellulose fibers alone, but also blended yarns made of recycled cellulose fibers and acrylic fibers or polyester fibers, woven or knitted fabrics made of the same, or yarns made of recycled cellulose fibers and acrylic yarns or polyester fibers. intertwisted yarns, interwoven fabrics,
Examples include interlaced knitted fabrics. The mixing ratio of recycled cellulose fibers and acrylic fibers or cationically dyeable polyester fibers is such that the acrylic fibers or cationically dyeable polyester fibers account for at most 50% by weight. Further, in the present invention, the treatment with an aqueous tannic acid solution may be performed before or after dyeing, but treatment after dyeing is preferable. The concentration of tannic acid is usually 10-60g/,
Preferably 15~50g/, temperature usually 30~95℃,
The treatment is preferably carried out at a temperature of 60 to 95°C and for a time of usually 0.5 to 60 minutes, preferably 10 to 60 minutes. Fibrous, thread, or fabric may be treated with tannic acid, but it is preferable to treat the fabric after dyeing, so fabric is usually treated. (Effects of the Invention) According to the present invention, a fiber structure consisting of modified regenerated cellulose fiber alone or regenerated cellulose fiber and acrylic fiber or polyester fiber can be manufactured without any decrease in strength or feel. Can be dyed with cationic dyes, can be dyed simultaneously with acrylic fibers or polyester fibers, and has good color fastness.
It has great industrial utility value, such as improving quality, simplifying processes, and lowering costs. (Example) The present invention will be specifically described below with reference to Examples. In addition, the dyeability, strength, texture,
Washing fastness was measured by the following method. (1) Stainability The optical density K/S at the maximum absorption wavelength was determined using a spectrophotometer. (2) Tenacity (g) Warp and weft yarns were measured using Tensilon. (3) Texture Judging by the feel. (4) Washing fastness Measured according to the method of JIS 0844 A-2. Examples 1 to 4 A modified rayon raw cotton containing 1% by weight of polystyrene sulfonate having a molecular weight of 10,000 was used to make a 30s spun yarn to obtain a plain weave fabric with a density of 100 in warp and 72 in weft (thread/inch). . After de-sizing using a commonly used enzymatic desizing agent, aqueous sodium carbonate solution containing 10 g of hydrogen peroxide (35%)/1 g of nonionic surfactant was used at pH 10.0, temperature 80°C, and treatment time.
It was exposed for 30, 60, and 90 minutes, washed with water, and then dried. Next, Cathilon Red BL-H (Hodogaya Chemical Co., Ltd.)
Staining was carried out for 60 minutes at a bath ratio of 1:50 and a temperature of 100°C with a dyeing solution of 5% WF, sodium acetate 1% OWF, and PH4.
It was treated at a temperature of 30 minutes at a bath ratio of 1:50, washed with water, and then dried. Comparative Example 1 uses regular rayon, and all other conditions are the same. Comparative Example 1 is without bleaching treatment, and Examples 2 to 4 have bleaching treatment times of 30, 60, and 90 minutes, respectively. The results are shown in Table 1.

[Table] After carrying out the usual desizing and scouring treatments, there was no change in the dyeability to cationic dyes even when treatments were carried out under various bleaching conditions. In addition, compared to regular, the cationic dye dyeing property of this example was greatly improved, and the washing fastness was also good. Examples 5-6 Using rayon containing polystyrene sulfonate, blended yarn 30s of rayon 80 and acrylic 20
A plain weave fabric with a density of warp 100 and weft 72 (thread/inch) was woven using the warp and warp threads. After de-sizing this fabric using an enzymatic desizing treatment, it was exposed to a sodium carbonate aqueous solution containing 10 g of hydrogen peroxide (35%) and 1 g of a nonionic surfactant at a pH of 10.0 and a temperature of 80°C for 30 minutes. After washing with water, it was dried by hot weathering at 105°C. Then Cathilon
Staining was carried out for 60 minutes at a bath ratio of 1:50 and a temperature of 100° C. using a dyeing solution of Red BL-H (manufactured by Hodogaya Chemical Co., Ltd.) of 5% OWF, 1% OWF sodium acetate, and PH4. Furthermore, it was treated with tannic acid (50 g/, 80°C x 30 minutes, bath ratio 1:50), washed with water, and then dried. Comparative Example 2 uses regular rayon, Example 5 uses polystyrene sulfonate with a molecular weight of 10,000 and modified rayon with a content of 1% by weight, and Example 6 uses polystyrene sulfonate with a molecular weight of 50,000. Modified rayon with a content of 1% by weight is used. The results are shown in Table 2.

【table】

[Table] In Comparative Example 2, only the acrylic was dyed, resulting in a frosty finish. In Examples 5 and 6, the frosting tone was improved, the level dyeing property was good, and the washing fastness was also good. Examples 7-8 1 polystyrene sulfonate with a molecular weight of 10,000
Using rayon containing 80% by weight,
A 30s spun yarn with an acrylic weight ratio of 20 was used to obtain a plain weave fabric with a density of 100 warp and 72 weft (thread/inch).
After desizing with a commonly used enzymatic desizing agent, it was treated with a sodium carbonate aqueous solution containing 1 g of nonionic surfactant at a pH of 10.0 and a temperature of 80°C.
After scouring for 60 minutes and washing with water, the concentration of tannic acid is 50
g/, 10 minutes each at a bath ratio of 1:30 and a temperature of 80°C.
It was treated for 30 minutes, washed with water and dried. Next, Cathilon Red BL-H (Hodogaya Chemical Co., Ltd.)
Staining was carried out for 60 minutes at a bath ratio of 1:50 and a temperature of 100°C using a staining solution of 5% OWF (manufactured by Mimaki Co., Ltd.), 1% OWF of sodium acetate, and PH4. Comparative Example 3 uses a regular rayon and acrylic blend yarn, and Comparative Example 4 uses an improved rayon and acrylic blend yarn but is not treated with tannic acid.

[Table] In Comparative Example 3, only the acrylic was dyed, giving it a frosty finish. In Comparative Example 4, the frosting tone was improved and the level dyeing property was good, but the washing fastness was poor. Examples 7 and 8 had good level dyeing properties and washing fastness.

Claims (1)

[Claims] 1. Regenerated cellulose fibers or fiber structures containing polystyrene sulfonate, which are treated with an aqueous solution of tannic acid before or after dyeing when dyeing them with a cationic dye. A method for dyeing fibers or fiber structures. 2 The molecular weight of polystyrene sulfonate is 1000~
2,000,000, the dyeing method according to claim 1. 3 0.1-20% by weight of polystyrene sulfonate
A dyeing method according to claim 1. 4. The dyeing method according to claim 1, wherein the concentration of tannic acid is 10 to 60 g/. 5 0.5 when the temperature of the aqueous solution of tannic acid is 30 to 90℃
The staining method according to claim 1, wherein the staining method is carried out for 60 minutes. 6. The dyeing method according to claim 1, wherein the fiber structure is a yarn, a woven fabric, or a knitted fabric. 7. The dyeing method according to claim 1, wherein the fiber structure contains at most 50% by weight of acrylic yarn fibers or polyester fibers.